Where is the Textools menu?
If you press N in the 3D viewport, a tool menu pops up in the top right corner. This menu has categories, separated by tabs running vertically on the side. Have a look and see if it added anything here (look in both edit mode and object mode):

I am basing this off the image that appears on the add-on's website - you can see all the &quot;action&quot; seems to happen from the same menu. The site says it has support for 2.8, but if it's not there, perhaps it isn't ready for 2.9 yet.